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Vercel AI Gateway begins supporting the OpenResponses API

·2026.01.15 22:00

Key point

Vercel AI Gateway supports OpenResponses API, OpenAI's open-source specification.

Details

Vercel AI Gateway is participating as a day 0 launch partner for OpenResponses API. OpenResponses is OpenAI's open-source specification for interoperability across various AI providers.

This API provides a unified interface for text generation, streaming, tool calling, image input, and reasoning.

Key supported features are as follows:

  • Text generation: Send and receive messages from any supported model
  • Streaming: Receive tokens in real time via SSE
  • Tool calling: Define function calls with structured arguments
  • Image input: Text and image input for vision models
  • Reasoning: Extended thinking support with configurable effort levels
  • Provider fallback: Configure automatic fallback chains across models and providers

Users can leverage OpenResponses using an AI Gateway key, and can easily switch between models from multiple providers by simply changing the model string.

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